INTERNATIONAL STANDARD

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1 Provläsningsexemplar / Preview INTERNATIONAL STANDARD ISO First edition Determination of particle size distribution by gravitational liquid sedimentation methods Part 3: X-ray gravitational technique Détermination de la distribution granulométrique par les méthodes de sédimentation par gravité dans un liquide Partie 3: Méthode aux rayons X par gravité Reference number ISO :2001(E) ISO 2001

2 ISO :2001(E) Provläsningsexemplar / Preview PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2001 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel Fax copyright@iso.ch Web Printed in Switzerland ii ISO 2001 All rights reserved

3 Provläsningsexemplar / Preview ISO :2001(E) Contents Page 1 Scope Normative references Terms and definitions Symbols Sampling Representation of results Principle Apparatus Sample preparation Procedure Tests in duplicate, validation and verification Calculation of results Test report... 7 Annex A Example of typical report... 9 Bibliography ISO 2001 All rights reserved iii

4 ISO :2001(E) Provläsningsexemplar / Preview Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this part of ISO may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO was prepared by Technical Committee ISO/TC 24, Sieves, sieving and other sizing methods, Subcommittee SC 4, Sizing by methods other than sieving. ISO consists of the following parts, under the general title Determination of particle size distribution by gravitational liquid sedimentation methods: Part 1: General principles and guidelines Part 2: Fixed pipette method Part 3: X-ray gravitational technique Annex A of this part of ISO is for information only. iv ISO 2001 All rights reserved

5 Provläsningsexemplar / Preview INTERNATIONAL STANDARD ISO :2001(E) Determination of particle size distribution by gravitational liquid sedimentation methods Part 3: X-ray gravitational technique SAFETY PRECAUTIONS This part of ISO does not purport to address all of the safety considerations associated with its use. It is the responsibility of the user of this part of ISO to establish appropriate safety and health practices and determine the applicability of the regulatory limitations prior to its use. 1 Scope This part of ISO describes a method for the determination of the particle size distribution of a powder dispersed in a liquid using gravity sedimentation. The measurement of the concentration of solids settling in a liquid suspension is achieved by monitoring the incremental signal absorption from a beam of X-rays. The method of determining the particle size distribution described in this part of ISO is applicable to powders which can be dispersed in liquids or powders which are present in slurry form. The typical particle size range for analysis is from about 0,5 µm to about 100 µm. The method is used for materials containing particles of the same chemical composition which produce adequate X-ray opacity. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO , General methods of test for pigments and extenders Part 10: Determination of density Pyknometer method. ISO 8213, Chemical products for industrial use Sampling techniques Solid chemical products in the form of particles varying from powders to coarse lumps. ISO , Representation of results of particle size analysis Part 1: Graphical representation. ISO , Determination of particle size distribution by gravitational liquid sedimentation methods Part 1: General principles and guidelines. ISO 14887, Sample preparation Dispersing procedures for powders in liquids. 3 Terms and definitions For the purposes of this part of ISO 13317, the terms and definitions given in ISO apply. ISO 2001 All rights reserved 1

6 ISO :2001(E) Provläsningsexemplar / Preview 4 Symbols For the purpose of this part of ISO 13317, the symbols given in ISO and the following apply. x St Stokes equivalent spherical diameter (m) (practical unit: micrometres, µm) η Suspending liquid viscosity ( Pa s), (practical unit: mpa s) h ρ s ρ l g t B C I 0 Sedimentation height (m) Sample density [effective particle density] ( kg m 3 ) Liquid density ( kg m 3 ) Acceleration due to gravity ( 9,807 m s 2 ) Sedimentation time, (seconds, s) Function of atomic number of sample elements in beam Concentration of sample in beam Attenuation of emergent X-ray beam passing through the suspending fluid I Attenuation of emergent X-ray beam through suspension at settling height h, at time t D X-ray density [ lg 10 (I 0 /I)] 5 Sampling The sampling procedure according to ISO shall be followed. 6 Representation of results The results shall be represented according to ISO Principle The concentration of dispersed sample is measured by attenuation of an X-ray beam. A stable, narrow, collimated beam of X-rays passes through a suspension of the sample: it is detected at a known height from the top of the sample cell. The sample cell is completely filled with sample suspension for the duration of the analysis. The settling height, h, at which the particle concentration, C, is determined, may be reduced during the analysis for the purpose of obtaining a more rapid analysis than would be possible if all measurements were made at the same value of, h. The cumulative mass percent of sample present at a given sedimentation height is continuously determined. The X- ray signal attenuation at the known height is compared to the attenuation with suspending liquid and also to the attenuation with the homogeneously dispersed sample present in the liquid. The attenuation of the emergent X-ray beam is proportional to the mass of powder in the beam, and is expressed by the following formula: I = I 0 exp ( BC) (1) or C =( 1/B) ln (I/I 0 ) (2) 2 ISO 2001 All rights reserved

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